JPH0522320Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a two-stage aeration device used to improve water quality in water sources such as lakes and dams, and in ports.

[Conventional technology]

Normally, in lakes and marshes with relatively large water depths, there is a large temperature difference between the surface water layer and the deep water layer.
In order to aerate and purify lake water, circulating both water layers using an air pump or the like lowers the temperature of the surface water layer, which may have an adverse effect on plants when water is used for agricultural purposes, for example. Furthermore, the temperature of the deep water layer may rise, which may cause problems, especially for cultivating cold water fish. Therefore, conventionally, as shown in FIG. 2, for example, an intermittent water pump 2 is provided in the surface water layer of the lake to circulate the lake water in the surface water layer as the air mass 1 rises, while the deep water layer is A continuous aeration cylinder 4 is installed in which the lake water in the deep water layer is circulated as minute air bubbles 3 rise to the surface, and the lake water in the surface layer and the lake water in the deep water layer are circulated separately. A staged aeration device has been proposed (see, for example, Japanese Utility Model Application No. 58-67597).

[Problem that the invention attempts to solve]

However, the conventional two-stage aeration equipment described above has a diameter of 1 mm and a total length of about 15 to 20 m, making it difficult to manufacture and requiring a large crane to transport and install. It had the problem of being large-scale. Moreover, since the interval between the upper and lower aeration devices cannot be changed after manufacture, there is also a problem of lack of flexibility.

[Means for solving the problem]

In order to solve the above-mentioned problems, the two-stage aeration device according to the present invention is a two-stage aeration device that is provided with a pair of upper and lower aeration devices that generate a rising water flow and aerate as air rises. , the upper aeration device and the lower aeration device are connected by a connecting means.

[Effect]

With the above configuration, it is possible to manufacture the upper and lower aeration devices separately, which not only makes manufacturing easier, but also makes it possible to reduce the weight as it only needs to have the strength as a single unit. can. Therefore, manufacturing costs can be reduced, and a standard aeration device manufactured for single use can also be used. What's more, it not only makes transportation and installation easier, but it also allows flexibility, such as changing the spacing between the upper and lower aeration devices, or separating the upper and lower aeration devices and using them independently, even after installation. be able to.

〔Example〕

An embodiment of the present invention will be described below based on FIG.

As shown in Fig. 1, the two-stage aeration system consists of a continuous aeration system 21, which is a lower aeration system connected to a sinker 11 installed on the lake bottom by a rope or chain 12, and a continuous aeration system 21, which is a lower aeration system connected to a sinker 11 installed on the lake bed. Above the device 21 there is a rope or chain 13 as a connecting means.
connected by a plurality of floats 14 on the upper outer circumference.
It consists of an intermittent aeration device 31 which is an upper aeration device equipped with...

The continuous aeration device 21 includes a cylindrical water pumping tube section 22, an air recovery cover 23 provided on the upper part of the water pumping tube section 22, and an air pipe provided on the inner circumference side of the lower part of the water pumping tube section 22. and a diffuser 26 which converts pressurized air supplied through air bubbles 24 into minute air bubbles 25 and releases them.

On the other hand, the intermittent aeration device 31 provided above the continuous aeration device 21 has an air mass generation tank 32.
and a water pumping cylinder section 33 provided above the air mass generating tank 32.

The air mass generation tank 32 is connected to the continuous aeration device 21 described above.
A cylinder 34a to which a rope or chain 13 to be connected is attached and a cylinder 3 provided outside the cylinder 34a.
4b are connected by an annular bottom plate 34c, and a cylindrical portion 34 with a bottom is provided at a predetermined interval on the outside of each of the cylinders 34a and 34b.
The two cylinders 35a and 35b are connected to each other by an annular top plate 35c. Cylinder 34 in the bottomed cylindrical portion 34
The upper part of the annular space 36 formed between the cylinder 35a and the cylinder 35a in the crested cylinder part 35 is
It opens on the lower inner surface side of 3.

In addition, the lower surface side 23a of the air recovery cover 23 in the continuous aeration device 21, the cylinder 34b in the bottomed cylindrical part 34, and the cylinder 3 in the crested cylindrical part 35
A flexible hose 38 communicates with an annular space 37 formed between the housing and the housing 5b.

In the above configuration, when pressurized air is sent to the diffuser 26 from the outside via the air pipe 24,
Minute air bubbles 25 are generated and float inside the water pumping cylinder section 22. Along with this, a large amount of oxygen dissolves in the lake water inside the water pumping cylinder part 22 and is activated, and an upward water flow is generated. Then, as shown by arrow A, the lake water in the deep water layer is sucked in from the lower part of the water pumping cylinder section 22 and rises, and is ejected from between the water pumping cylinder section 22 and the air recovery cover 23. Therefore,
The entire area of lake water in the deep water layer is activated and purified.

On the other hand, air bubbles 2 floating inside the water pumping cylinder part 22
5 is collected on the lower surface side 23a of the air collection cover 23 and collected inside the crested cylindrical part 35 via the flexible hose 38, pushing down the lake water inside. Eventually, when this water level reaches the lower end of the cylinder 35a, the accumulated air passes through the annular space 36 formed between the cylinders 34a and 35a according to the siphon principle, as shown by arrow B. The air is blown out all at once to the lower part of the water pumping cylinder part 33, and an air mass 41 is formed. When this air mass 41 rises to the surface, the lake water above and below the air mass 41 moves upwards, and as shown by arrow C, the lake water at the bottom of the surface water layer is sucked in from below the pumping cylinder 33 and is brought close to the water surface. It is activated by being pushed up to the surface and mixed vigorously with the surface lake water, which is rich in dissolved oxygen.

This cycle also has the excellent effect of preventing the abnormal proliferation of cyanobacteria by drawing surface algae, especially blue-green algae, to areas below the surface water layer where light cannot reach.

On the other hand, pressurized air continues to be sent to the differential user 26 from the outside, so the same operation is repeated.

As described above, when the lake water in the surface water layer and the lake water in the deep water layer are circulated, an artificial cline 42 is formed between the lake water in both water layers. The width can be arbitrarily set by changing the length of the rope or chain 13.

In the present invention, the lower aeration device and the upper aeration device are not limited to the continuous aeration device and the intermittent aeration device, respectively, as described above.

Further, the connection means may be a lobe or a chain 13.
However, the connection member is not limited to the above, and may be a connecting member that can be easily connected.

[Effect of idea]

As described above, the two-stage aeration device according to the present invention is a two-stage aeration device that is provided with a pair of upper and lower aeration devices that generate a rising water flow and aerate as air rises. and the lower aeration device are connected by a connecting means. As a result, the upper and lower aeration devices can be manufactured separately, which not only facilitates manufacturing, but also allows for weight reduction, as the unit only needs to have sufficient strength. Therefore, manufacturing costs can be reduced, and a standard aeration device manufactured for standalone use can also be used. What's more, it not only makes transportation and installation easier, but even after installation, you can have flexibility by changing the spacing between the upper and lower aeration devices, or by separating the upper and lower aeration devices and using them independently. It has the effect of being able to do it. In addition, a diffuser that releases microbubbles is installed inside the lower end of the lower pumping tube, and an air recovery cover is installed on the top of the lower pumping tube. Since the air mass generating tank in the lower part is connected with a hose, oxygen is dissolved as much as possible by microbubbles in the lower water pumping cylinder, and then the microbubbles are collected and air is transferred to the air chamber in the upper water pumping cylinder. It has the effect of supplying Therefore, there is an effect that oxygen can be actively supplied to the bottom side of the water where the amount of dissolved oxygen is small.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view showing the overall structure of an embodiment of the present invention, and FIG. 2 is a vertical sectional view showing a conventional example. 13 is a rope or chain (connection means), 21
31 is a continuous aeration device (lower aeration device), and 31 is an intermittent aeration device (upper aeration device).

Claims (1)

[Scope of utility model claims] In a two-stage aeration system that is provided with a pair of upper and lower aerators that generate a rising water flow in a water pumping cylinder part as air floats up, and aerate the water, the upper aerator and the lower aerator are connected by a connecting means. ,
and a diffuser that generates microbubbles is installed inside the lower end of the lower water pumping cylinder that constitutes the lower aeration device, and an air recovery cover is provided on the upper part of the lower water pumping cylinder, and the top of the recovery cover and A two-stage aeration device characterized in that an upper water pumping cylinder part and an air mass generation tank are connected with a hose.